-12+2r=8r-4r

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Solution for -12+2r=8r-4r equation: 



-12+2r=8r-4r

We move all terms to the left:

-12+2r-(8r-4r)=0

We add all the numbers together, and all the variables

2r-(+4r)-12=0

We get rid of parentheses

2r-4r-12=0

We add all the numbers together, and all the variables

-2r-12=0

We move all terms containing r to the left, all other terms to the right

-2r=12

r=12/-2

r=-6

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